/* 基础样式 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary-color: #2563eb;
  --text-color: #1f2937;
  --text-secondary: #6b7280;
  --bg-color: #ffffff;
  --border-color: #e5e7eb;
  --code-bg: #f3f4f6;
  --footer-bg: #f9fafb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #f3f4f6;
    --text-secondary: #9ca3af;
    --bg-color: #111827;
    --border-color: #374151;
    --code-bg: #1f2937;
    --footer-bg: #1f2937;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部 */
.site-header {
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.site-title a {
  color: var(--text-color);
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--primary-color);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* 主体 */
.site-main {
  min-height: calc(100vh - 200px);
}

/* 首页 */
.home-content .intro {
  margin-bottom: 2rem;
}

.home-content .intro h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  margin-bottom: 2rem;
}

.skill-tags .tag {
  background-color: var(--primary-color);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.recent-posts {
  margin-bottom: 2rem;
}

.recent-posts h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.post-list {
  list-style: none;
}

.post-item {
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem;
}

.post-item a {
  color: var(--text-color);
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  flex: 1;
}

.post-item a:hover {
  color: var(--primary-color);
}

.post-item .category {
  background-color: var(--code-bg);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.post-item .date {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.view-all {
  text-align: right;
  margin-top: 1rem;
}

.view-all a {
  color: var(--primary-color);
  text-decoration: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  margin-bottom: 2rem;
}

.stat-item {
  background-color: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.projects-section {
  margin-top: 2rem;
}

.projects-section h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.project-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.project-card h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* 博客列表 */
.blog-list h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.categories {
  margin-bottom: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.category-link {
  text-decoration: none;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.category-link:hover, .category-link.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* 博客文章 */
.blog-post h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.post-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.blog-post .content {
  font-size: 1.1rem;
  line-height: 1.8;
}

.blog-post .content h2 {
  font-size: 1.6rem;
  margin: 2rem 0 1rem;
}

.blog-post .content h3 {
  font-size: 1.4rem;
  margin: 1.5rem 0 0.8rem;
}

.blog-post .content p {
  margin-bottom: 1rem;
}

.blog-post .content pre {
  background-color: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0;
}

.blog-post .content code {
  background-color: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.blog-post .content ul, .blog-post .content ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

.blog-post .content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1rem 0;
}

/* 表单 */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 1rem;
}

.form-group textarea {
  min-height: 200px;
  resize: vertical;
}

.error-message {
  background-color: #fef2f2;
  border: 1px solid #f87171;
  color: #991b1b;
  padding: 0.75rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s;
}

.btn:hover {
  background-color: #1d4ed8;
}

.btn-secondary {
  background-color: var(--code-bg);
  color: var(--text-color);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

/* 工具页面 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.tool-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text-color);
  transition: border-color 0.2s;
}

.tool-card:hover {
  border-color: var(--primary-color);
}

.tool-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 编辑器 */
.editor-toolbar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

/* 文件分享 */
.file-list {
  width: 100%;
  border-collapse: collapse;
}

.file-list th, .file-list td {
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0.5rem;
  text-align: left;
}

/* 相册 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.gallery-item {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.gallery-item img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.gallery-item-info {
  padding: 0.75rem;
}

.gallery-item-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

/* 留言板 */
.guestbook-item {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.guestbook-item-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.guestbook-item-name {
  font-weight: 600;
}

.guestbook-item-date {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--footer-bg);
  padding: 2rem 0;
  margin-top: 3rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 768px) {
  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
  }

  .site-nav.open {
    display: flex;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .post-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }
}